CVE-2026-20789: Intel PROSet WiFi Privilege Escalation

CVE-2026-20789 Overview

CVE-2026-20789 is an improper access control vulnerability [CWE-284] in Intel PROSet/Wireless WiFi Software for Windows. The flaw resides in Ring 2 device drivers and allows an unprivileged local attacker to escalate privileges. Exploitation requires local access but no authentication and no user interaction. A successful attack enables local code execution and impacts system availability at a high level, with cascading confidentiality impact on connected system components.

Critical Impact
An unauthenticated local attacker can achieve privilege escalation and local code execution through the vulnerable Intel PROSet/Wireless WiFi driver on Windows, compromising downstream system confidentiality.

Affected Products

Intel PROSet/Wireless WiFi Software for Windows
Intel WiFi device drivers operating within Ring 2
Refer to Intel Security Advisory SA-01422 for specific affected versions

Discovery Timeline

2026-08-11 - CVE-2026-20789 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-20789

Vulnerability Analysis

The vulnerability is classified as improper access control [CWE-284] within Intel PROSet/Wireless WiFi device drivers on Windows. Device drivers execute with elevated kernel-adjacent privileges, so any access control gap allows unprivileged callers to reach operations that should be restricted. The advisory categorizes the flaw as a Ring 2 device driver issue, meaning kernel-mode driver code fails to properly validate the caller's privilege level before performing sensitive operations.

Successful exploitation yields local code execution in a higher privilege context. The confidentiality and integrity impact on the vulnerable driver itself is limited, but availability impact is high and subsequent system confidentiality impact is high. This pattern is typical of privilege escalation primitives that lead to control of a broader user or system context.

Root Cause

The root cause is missing or insufficient access control enforcement in driver-exposed interfaces. Kernel drivers commonly expose IOCTL handlers, device objects, or shared resources that must gate access based on caller identity. When these checks are absent or bypassable, any process running on the host can invoke privileged driver functionality. Intel's advisory identifies the defect as improper access control within Ring 2 device driver code paths.

Attack Vector

Exploitation requires local access to a Windows host running the vulnerable Intel PROSet/Wireless WiFi Software. An unprivileged process opens a handle to the affected driver interface and issues requests that should require elevated rights. Because the driver does not properly enforce access control, the request executes and returns a privileged primitive to the attacker. The attacker chains this primitive into arbitrary code execution at a higher integrity level, no user interaction required. Refer to Intel Security Advisory SA-01422 for vendor-supplied technical details.

Detection Methods for CVE-2026-20789

Indicators of Compromise

Unexpected user-mode processes opening handles to Intel PROSet/Wireless WiFi driver device objects
New or unsigned child processes spawned from svchost.exe or wireless service binaries following driver interaction
Unexpected loading or reloading of Intel WiFi driver binaries outside of update or install windows
Privilege escalation events where a low-integrity process suddenly gains SYSTEM or administrator context

Detection Strategies

Monitor DeviceIoControl calls against Intel PROSet/Wireless driver device paths from non-standard callers
Alert on process integrity level transitions that follow interaction with WiFi driver interfaces
Baseline expected callers of the driver and flag deviations using endpoint behavioral analytics
Correlate driver-related events with subsequent credential access or lateral movement activity

Monitoring Recommendations

Enable Windows kernel driver load auditing and forward events to a centralized data lake for retention and hunting
Track Intel PROSet/Wireless version inventory across managed endpoints to identify unpatched hosts
Watch for privilege escalation TTPs mapped to MITRE ATT&CK T1068 (Exploitation for Privilege Escalation)
Review EDR telemetry for anomalous kernel driver interactions on laptops and mobile workstations

How to Mitigate CVE-2026-20789

Immediate Actions Required

Inventory all Windows endpoints running Intel PROSet/Wireless WiFi Software and identify affected versions
Apply the driver and software updates published in Intel Security Advisory SA-01422
Restrict local logon and interactive access on high-value hosts until patches are deployed
Enable driver load and process creation auditing to detect exploitation attempts during the patch window

Patch Information

Intel has published fixed versions of the PROSet/Wireless WiFi Software through Intel Security Advisory SA-01422. Administrators should deploy the updated driver package via standard software distribution tooling and verify installation using the vendor-provided version numbers. Reboot the endpoint after installation to ensure the vulnerable driver is unloaded.

Workarounds

Where patching is delayed, disable the Intel PROSet/Wireless WiFi Software service on hosts that do not require Intel-branded management functionality
Enforce least privilege on endpoints so that a local escalation primitive has fewer downstream targets
Restrict physical and remote interactive access to laptops running vulnerable driver versions
Use application control policies to block untrusted binaries from interacting with kernel driver interfaces

bash

# Query installed Intel PROSet/Wireless WiFi Software version on Windows
Get-WmiObject Win32_PnPSignedDriver | Where-Object { $_.DeviceName -like "*Intel*Wireless*" } | Select-Object DeviceName, DriverVersion, DriverDate